Process of coating building blocks



May 11 1926. 1,583,918

l H. E. DUNN PROESS OF COATING BUILDING -BLOC'KS Filed April 16, 1923 2 Sheets-Sheet 2 HHH miam HurvBDunn 1B/fJ ML for-exposuretothe elements and for ap lPatented ll, 192.6.' i

oFFicE, r

nanny n. DUNN, lor' HOLLAND, ,.mcniGAN, AssIeNon or ONE-Hanrrcwrrmau E.

p DUNN, or HOLLAND, MICHIGAN.

PROCESS F COA'ING BUILDING BLOCKS.

l This invention relates to a process of coating cement building blocks. --Cement blocks` vmay be made'in many ways but as a rule vall sides` thereof are more or less roughand pitted and in order to, provide a proper face pearance,"it .is sometimes the practice to' give the' block von `-the side or face to` be thusv exposed a ni'shing coat-,eitherof neat cement or a relatively rich mixture of cement and sand,'preferably the latter, such coat v or strata of inercementitious material being placed inone 'side of .the block form prior;

to' putting-fin the coarser aggregate lfrom which made. .n

With my process the cement' block is l l made fromy a. single 'relatively coarse vaggregate Aand'jbefore thev cementitious imaterialhas set-:and hardened, a coating 4is applied to the side-which is' to beexposed in a'novel manner and in .such a way that i' the coating adheres and interlocks with the 1- :facture so thatquantity production is helped.v A

block and a relatively smoothand water re' sistant coating or face is permanently attached/with a saving of time in rblock manu- "This' novel process of applying the coatinfr or face to the'blocks includes many novell steps forthe succcessful and practical at- .tainment-or'v the results desired, -as will ap.

. 4pear in detailas understandin 'ofthe in- 1 venti'on isrhad from ythe following descrip.

:van

tion, taken in connection vwith the accompanying drawings showing the best form of apparatus. for carrying out. the process known to me, in. which drawings,

Fi 4e is a fragmentary side elevation of 1 said opperjand a vertical longitudinal section through the gun.

Fig. 51s a .fragmentary vertical longi-I" tudinalV section through t e outer end of the gun, showing the coveri lwhen the device' lsnot in u an the ,maipr' portion. of the block' is,

ca 'therefory Fig. 6 is a central verticalv section through the vreceptacle in whchthe cement, water, coloring matter and waterproofing material is mixed and held; i l Like reference characters refer to like parts in the different gures of the drawings.- H i, In the construction ofthe apparatus used in' erforming the-process a Emixing yand hol' ing receptacle is used, comprising a'. cyllndricalsheet metal wall 1, havingv an open upper end normally closed by a-.cover 2 1n which a vent opening 3 is" made and on which at its center and on its'under side an inverted cone 4 is attached fora purpose 4later described.- The recvzeptacle L mayl be suspended from any'suitable'everhead sup-'r' port by means of a bail, as' Jshown in Fig.

A6,' At the .lower end of the member 1, a

second member 6 alsofofjsheet metal is se# cured, thev same. tapering inwardly and downwardly to its smaller open lower end at which` a cylindricalfmember 7 of relaj tively small.' diameter is attached and exlowerend having a lianged collar 8 perma-i nently secured thereto. A casti1ig9,substan tially semispherical in shape is attached to the collar 8 by bolts or equivalent fastening's, closing-the lower end ofthe receptacle.

.A nipple 10 passes through 'the lower side of the member 9, to which nipple a valve 11 is connected, there being an air carrying Centrally. of the receptacle. thus made a verticalftubefl?) isV located, its upper end tends downwardly for a. distance, atvitsv Bio hose ,12 connected to the .valve inturn. l

coming directly below the point of the cone 4' and` its lower end being located a short distance above the inner side ofthe member land cement, ,together with a suitable cement waterproofing material and any desired kind of coloring matter,l all being dissolved asmuchas may be in the water. By opening valve 11, compressed air is entered into the lower end ory the receptacle and passes 11p- Awardlythrough the tube 13, carrying the cef ment andothe'r materials in` solution ups,

wardly throughI the tube and projecting the same against the cone 4 whereby such materials are directed back into the mass of ma? terials in the receptacle. There isa continuous circulation of the materials in the receptacle and a continual stirring and mixlng 'thereof when the air is passed to the recep- ,tacle.

The flow ot air is regulated by the 'valve 11 and the air escapes from the receptacle through the vent-3.

In a side oit? the member 6`of the receptacle, an outlet pipe or nipple 16 is secured, having a screen applied thereto at its inner end within the receptacle, as shown at 17 and a hose 18 connected to its outer end for carrying themixture of water, cement, coloring material and waterproofing material to the spraying gun which directs the same against the tace of the cement block.

The gun comprises a horizontal barrel portion 19 at the rear end of which a handle 20 extends downwardly. An air carrying hose .21, at one end has connection with a T 22 to -which the irst hose 12 has con- 1 nection at one side, the supply of air for the two lengths of hose 12 and 21 being carried to the T through a hose 23. The hose 21 leads to the lower end of handle 20 and has communication with a longitudinal passage 24 lengthwise of the handle and which joins with a relatively large opening 25 bored in the rear end of the barrel 19. A plug 26 is threaded into the rear end of the opening 25, closing the same and leaving an interiorchamber to which the air from hose` 21 passes. A regulating needle 27 is passed through the plug 26 and has a screw connection therewith, at its outer rear end being equipped with an operating head 28 for man- .ual operation. The inner end of the needle 27. has a conical point to conform to the Y34 is screwed: into the frontend of barrel 19, the tube 33 passing therethrough, and

4on to the front end of the sleeve a nozzle member 35 is attached, at its. front end being formed on its inner sides wlth a conlcal restriction 36 which leads to a small passage 37 in theend of the nozzle, the nozzle Har-` ing outwardly from said passage, as indicated at 38. The free end of the tube 33 extends neary7 to the passage 37.

It is evi nt, that when the air` is permitted to pass through the passage 31 and tube 33` by operating the needle 27 outwardly,

such passage creates a suction which serves to draw the mixture in the receptacle through the hose 18 into the spaces around the tube 33 and as the air passes outwardly at the end of the nozzle, the mixture of water, cement, waterproofing material and coloring matter joins therewith and is projected outwardly in a jet or spray, as indicatedin Fig. 1. The quantity of air allowed to pass is controlled by the needle 27 and the same may be entire y shutoff and the protection of the jet or spray stopped by turning the needle so that its end '29 seats against the seat 30. A cap 39 may be fitted over the end of the nozzle when. the device is not in use, as shown in Fi 5.`-

A hopper 40 ma e from sheet metal and having a downwardly andI forwardly inclined bottom 41 is attached to the gun so as to bepositioned above it bymeans of supports 42 ont-he lower side -of the hopper which connect to lugs or brackets 43 cast with the barrel 19 at the' upper side thereof. In the front. side of the hopper substantially at its lowest point an opening 44 ismade so that sand carried in vthe hopper may flow therethrough into the projected jet or spray Vfrom the nozzle and be carried forward with it when the opening is open.

A closure member 45 of sheet metal is pivotally mounted -at one end at 46 to the front y' of the hopper and at one side of the openingI 14, said member being manually operable up and down to open or closet-he opening 44, the free end portion of the closure member being held behind a guide 47 so as not to spring outward under pressure of the sand and to safeguard it against bending outwardly accidentally. The volume -of sand that passes through the o ning 44 may be controlled by raising an lowering the member 45 to gage the extent that opening 44 is opened.

The front of the hopper 40 is a distance in front of the nozzle so that the stream of sand assing :from the opening `4:4: drops direct y into the jet or spray projected from thel nozzle. The' block 48 formed from vcementitious material is taken from 'the form in which it is made very' soonv after the material for the blocks has been entered into the -form and before. the cementitious material has hardened and set. Immediately after taking from the form the facing coat is a plied by directing thejet from the nozz e withl the sand falling into the same against the side lof the block to be faced.'

The cementitious mixture adheres to the side of the block and penetrates. the voids therein at the said side of the block, retains the sand and makes a water impervious coating vfoi; the block which soon; sets and hardens purposes. The coloring matter may or may this respect. material may also be omitted it desired and Lessors not loe used, it matter cui vchoice lin course the Waterprooiing the facing consist only Qt cementand sand. However, the process contemplates the use of any combination ot' the elements whichv may be held either in suspension or in so lotion in the Water in the receptacle Where I the same are mixed`and stirred, and is not limited Iin any respect in* this connection.

This process of nishmg building blocks ,is very edective and has proved so in practhe apparatus or inetlmnnentalitiesyused;a

li claim:

` l. rEhe grocess of coating a side*v ot a building ook which consists in projecting e jet ot' water and cement in solution or susypension in said Water toward said side of the block and introducing sand into the moving jet immediately prior to the contact thereof with the block. i

2. The process ont coating a side of a building block Wliiehlc'onsists in projecting a, jet of Water and cement in solution or suspension in said Water toward said side of the block, and continuously feedingl sand into the moving jet before it reaches said block.

3. rlhe herein described process of coating a building block'vvhich consists in pro jecting a cementitious composition including Water and cement against asurface of a liloclr ot' cementitious Vmaterial5 newly 'formed and' not set or hardened and' feed- I ing sand into the moving jet oit cementitious composition heitere it strikes the side of the 40 block.

Ai.. The process ot' coating a, structure formed of cementitious material which consiste in projecting a' jet of mixed water and cement in solution or suspension therein toi5 Werd and against a side of the structure, and continuously dropping a stream of sand into the moving jet to mix therewith and he carried to said structure. v

5. The process of coating a structure 50.

formed of cementitious material which consists in pneumatically projecting a jet of mixed Water and cement toward a side of the structure, and continuously feeding a stream of sand from above into the ,moving 55 jet to mix therewith and be carried .to said structure. f 'I Y y 6. The process of coating a structure of cerneutitious material of relatively coarse aggregate, which consists in projecting a'jet 6l? ot mixed water, cement and Waterproofing material continuously against said structure, and continuously introducing sand into the moving jet to mix therewith and be carried therewith to said structure.-.

7. The herein described ,process of coating a structure formed of eementitious mate. rial of relatively coarse aggregate, which consists in pneumatieally projecting a oontinuous jet of mixed Water and cement 7 0 against a side ot' ,the structure, and continun ously feeding e stream of sand by gravity into the moving jet at the upper side thereof to mix therewith and be carried therewith to said structure. .Y '15 lin testimony vwhereof allix my signature..

Y HARRY E. DUNN. 

